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SUMMARY:Single electron transistors coupled to resonators: from cooling to
  lasing - Dr Andrew Armour\, University of Nottingham
DTSTART:20080228T141500Z
DTEND:20080228T151500Z
UID:TALK9316@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:\nIn this talk I will discuss the dynamics of a resonator coup
 led to a\nmesoscopic conductor known as a superconducting single electron\
 ntransistor (SSET). The SSET supports a number of current resonances\nwhic
 h can alter the dynamics of the resonator significantly and in a\nway whic
 h depends very sensitively on the precise choice of\noperating point for t
 he transistor. For bias points on one side of a\ncurrent resonance (red de
 -tuning)\, the SSET acts on the resonator\nlike a thermal bath with a very
  low effective temperature which\nunder certain circumstances can actually
  be used to cool the\nresonator. In contrast\, for bias points on the oppo
 site side of a\nresonance (blue de-tuning) the SSET can drive the resonato
 r into\nlaser-like states of self-sustained oscillation. Recent experiment
 s\nhave realized this system with two very different types of\nresonator\,
  namely a mechanical resonator consisting of a suspended\nbeam with a fund
 amental frequency of 20MHz [Naik et al.\, Nature 443\,\n193 (2006)] and a 
 superconducting strip-line resonator with a\nfrequency of 10GHz [Astafiev 
 et al.\, Nature 449\, 588].\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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